Check the brush end bearings for debris build-up and sticking bearings--remove the brush assembly, and pull off the bearing blocks. Clean the pin ends on the brush and the interiors of the bearing blocks with Q-tips, then lightly oil (3-in-one or similar) the bearing blocks and pin ends. Reassemble the brush into the sweeper head without the belt on--check for free turning of the brush. If ok, install the belt, and check for operation. Hope this helps!
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